import React from 'react';
import ReactDOM from 'react-dom';
import './index.css';
function Square (props:Object) {
    return (
        <button className="square" onClick={()=>{props.onClick()}}>
            {props.value}
        </button>
    );
}


class Board extends React.Component {
    renderSquare(i:number) {
        return <Square
            value={this.props.squares[i]}
            onClick={() => this.props.onClick(i)}
        />;
    }

    render() {
        return (
            <div>
                <div className="board-row">
                    {this.renderSquare(0)}
                    {this.renderSquare(1)}
                    {this.renderSquare(2)}
                </div>
                <div className="board-row">
                    {this.renderSquare(3)}
                    {this.renderSquare(4)}
                    {this.renderSquare(5)}
                </div>
                <div className="board-row">
                    {this.renderSquare(6)}
                    {this.renderSquare(7)}
                    {this.renderSquare(8)}
                </div>
            </div>
        );
    }
}

class Game extends React.Component {

    // eslint-disable-next-line no-useless-constructor
    constructor(props) {
        super(props);
        this.state = {
            history: [{
                squares: Array(9).fill(null)
            }],
            stepNumber: 0,
            xIsNext: true
        }
    }

    handleClick (i:number) {
        const history = this.state.history.slice(0, this.state.stepNumber + 1);
        const current = history[history.length - 1];
        const squares = current.squares.slice();
        if (calculateWinner(squares) || squares[i]) {
            return
        }
        squares[i] = this.state.xInNext?'X':'O';
        this.setState({
            history: history.concat([{
                squares: squares
            }]),
            xInNext: !this.state.xInNext,
            stepNumber: history.length
        })
    }

    jumpTo(step) {
        this.setState({
            stepNumber: step,
            xIsNext: (step % 2) === 0,
        });
    }

    render() {
        const history = this.state.history;
        const current = history[this.state.stepNumber];
        const winner = calculateWinner(current.squares);

        const moves = history.map((step, move) => {
            const desc = move ?
                'Go to move #' + move :null;

                if (desc) {
                    return (
                    <li key={move}>
                        <button onClick={() => this.jumpTo(move)}>{desc}</button>
                    </li>
                    );
                }else {
                    return null
                }
        });

        let status;
        if (winner){
            status = 'Winner:' + winner
        } else {
            status = 'Next player:' +(this.state.xInNext ?'X':'O')
        }
        return (
            <div className="game">
                <div className="game-board">
                    <Board
                        squares={current.squares}
                        onClick={(i)=>this.handleClick(i)}
                    />
                </div>
                <div className="game-info">
                    <div>{status}</div>
                    <div><button
                        onClick={
                            () => {
                                this.setState({
                                    history: [{
                                        squares: Array(9).fill(null)
                                    }],
                                    stepNumber: 0,
                                    xIsNext: true
                                })
                            }
                        }
                    >{'new game'}</button></div>
                    <ul>{moves}</ul>
                </div>
            </div>
        );
    }
}

// ========================================

ReactDOM.render(
    <Game />,
    document.getElementById('root')
);

function calculateWinner(squares) {
    const lines = [
        [0, 1, 2],
        [3, 4, 5],
        [6, 7, 8],
        [0, 3, 6],
        [1, 4, 7],
        [2, 5, 8],
        [0, 4, 8],
        [2, 4, 6],
    ];
    for (let i = 0; i < lines.length; i++) {
        const [a, b, c] = lines[i];
        if (squares[a] && squares[a] === squares[b] && squares[a] === squares[c]) {
            return squares[a];
        }
    }
    return null;
}
